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PDF AS2208D Data sheet ( Hoja de datos )
| Número de pieza | AS2208D | |
| Descripción | Primary Side PWM Controller | |
| Fabricantes | ETC | |
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AS2208
Primary Side PWM Controller
Preliminary Specification
Features
• Low Startup Current
• Single-start or auto-restart
modes
• Oscillator trimmed for precision
duty cycle clamp
• Standard temperature range
extended to 105°C
• Remote on / off control
• Self limiting supply Voltage
• Standard current mode control
Description
The AS2208 is a simplified pulse width modulation control-
ler, offering similar functionality as that of the AS3842.
Based on the AS2214, the AS2208 provides the additional
features of low startup current and overvoltage latching,
making it a good solution for adapter applications.
The PWM function is controlled by the current sense com-
parator for normal current mode control. The COMP pin,
which serves as an input to the current sense comparator,
provides a 1 mA current source which can be tied directly to
the control loop optocoupler. The output stage is a high
current totem pole output that sees only 85 ns delay from the
PWM comparator.
The AS2208 requires only 100 µA of startup current. The
undervoltage lockout (UVLO) thresholds are nominally 14V
for turn on and 8 V for turn off. The VREG pin, based on a
trimmed bandgap reference, provides a temperature com-
pensated 5 V to loads of up to 50 mA. The oscillator
discharge current is trimmed to provide guaranteed duty
cycle clamping.
Pin Configuration — Top view
PDIP (N)
COMP 1
ISNS 2
RT/CT 3
OV 4
8 VREG
7 VCC
6 OUT
5 GND
8L SOIC (D)
COMP 1
ISNS 2
RT/CT 3
OV 4
8 VREG
7 VCC
6 OUT
5 GND
Ordering Information
Package
8-Pin Plastic DIP
8-Pin Plastic SOIC
ASTEC Semiconductor
Temperature Range
0 to 105° C
0 to 105° C
77
Order Code
AS2208N
AS2208D
1 page  
Primary Side PWM Controller
AS2208
Electrical Characteristics (cont’d)
Electrical Characteristics are guaranteed over full junction temperature range (0 to 105° C). Ambient temperature must be derated
based on power dissipation and package thermal characteristics. Unless otherwise specified, the conditions of test are VCC = 15 V;
BOK = 3 V; OV = 0V; RT = 680 Ω; CT = 10 nF. To override UVLO, VCC should be raised above 18 V prior to test.
Parameter
Symbol Test Condition
Min Typ Max Unit
Output
Output Low Level
Output Low Level
Output High Level
Output High Level
Rise Time
Fall Time
Maximum Duty Cycle
Minimum Duty Cycle
Over-Voltage Input
OV Threshold
OV Reset Threshold
OV Clear Threshold
OV Bias Current
Under Voltage Lockout
Startup Threshold
Minimum Operating Voltage
after Turn-on
Startup Current
Operating Supply Current
Supply Voltage Clamp
Output Impedance to GND in
UVLO State
VOL
VOL
VOH
VOH
tR
tF
DMAX
DMIN
ISINK = 20 mA
ISINK = 150 mA
ISOURCE = 20 mA
ISOURCE = 150 mA
CL = 1 nF
CL = 1 nF
VOV
VVOVH
VVOVL
IBIAS OV
VREG = 5 V, VOV ≤ OV Threshold
VCC (ON)
VCC (OFF)
ICC
ICC
VCC Zener
ZOUT
VCC = 13 V
ICC = 30 mA
VCC = 6 V
0.1 0.4
V
1.5 2.2
V
13 13.5
V
12 13
V
50 150 ns
50 150 ns
94 97 100 %
0%
2.50 2.80 3.10 V
3.80 4.00 4.50 V
1.10 1.75 2.20 V
-1 -0.2 1 µA
12.5 14.0 15.8 V
7.3 8.0 8.5 AV
105 150
12 20
18
22.0
µA
mA
V
kΩ
ASTEC reserves the right to make changes without further notice to any products described herein to improve reliability, function, or
design. ASTEC does not assume any liability arising out of the application or use of any product or circuit described herein; neither does
it convey any license under its patent rights or the rights of others. ASTEC products are not authorized for use as components in life
support devices or systems intended for surgical implant into the body or intended to support or sustain life. Buyer agrees to notify
ASTEC of any such intended end use whereupon ASTEC will determine availability and suitability of its products for the intended use.
ASTEC and the ASTEC logo are trademarks of ASTEC (BSR) PLC.
ASTEC SEMICONDUCTOR
255 Sinclair Frontage Road • Milpitas, California 95035 • Tel. (408) 263-8300 • FAX (408) 263-8340
ASTEC Semiconductor
81
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet AS2208D.PDF ] | |
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